#pragma once
// -------------------------------------------------
// BlinKit - BlinKit Library
// -------------------------------------------------
//   File Name: ChildNodeList.h
// Description: ChildNodeList Class
//      Author: Ziming Li
//     Created: 2022-03-02
// -------------------------------------------------
// Copyright (C) 2022 MingYang Software Technology.
// -------------------------------------------------

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 *           (C) 1999 Antti Koivisto (koivisto@kde.org)
 *           (C) 2001 Dirk Mueller (mueller@kde.org)
 * Copyright (C) 2004, 2007 Apple Inc. All rights reserved.
 * Copyright (C) 2014 Samsung Electronics. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef ChildNodeList_h
#define ChildNodeList_h

#include "blinkit/blink/renderer/core/dom/container_node.h"
#include "blinkit/blink/renderer/core/dom/node_list.h"
#include "blinkit/blink/renderer/core/html/CollectionIndexCache.h"
#include "blinkit/blink/renderer/wtf/PassRefPtr.h"

namespace blink {

class ChildNodeList final : public NodeList
{
public:
    static PassRefPtrWillBeRawPtr<ChildNodeList> create(ContainerNode& rootNode)
    {
        return adoptRefWillBeNoop(new ChildNodeList(rootNode));
    }

    ~ChildNodeList() override;

    // DOM API.
    unsigned length() const override { return m_collectionIndexCache.nodeCount(*this); }
    Node* item(unsigned index) const override { return m_collectionIndexCache.nodeAt(*this, index); }

    // Non-DOM API.
    void invalidateCache() { m_collectionIndexCache.invalidate(); }
    ContainerNode& ownerNode() const { return *m_parent; }

    ContainerNode& rootNode() const { return ownerNode(); }

    // CollectionIndexCache API.
    bool canTraverseBackward() const { return true; }
    Node* traverseToFirst() const { return rootNode().firstChild(); }
    Node* traverseToLast() const { return rootNode().lastChild(); }
    Node* traverseForwardToOffset(unsigned offset, Node& currentNode, unsigned& currentOffset) const;
    Node* traverseBackwardToOffset(unsigned offset, Node& currentNode, unsigned& currentOffset) const;

    DECLARE_VIRTUAL_TRACE();

private:
    explicit ChildNodeList(ContainerNode& rootNode);

    bool isChildNodeList() const override { return true; }
    Node* virtualOwnerNode() const override;

    RefPtrWillBeMember<ContainerNode> m_parent;
    mutable CollectionIndexCache<ChildNodeList, Node> m_collectionIndexCache;
};

DEFINE_TYPE_CASTS(ChildNodeList, NodeList, nodeList, nodeList->isChildNodeList(), nodeList.isChildNodeList());

} // namespace blink

#endif // ChildNodeList_h
